JPH08267709A - Printed image post processing device - Google Patents

Abstract

PURPOSE: To provide a separation means which is detachable and can separate an excess ink from an excess ink removing liquid efficiently in a device wherein an already-printed body to be printed is conveyed by a contact roller coated with the extra ink removing liquid and an opposed roller so as to transfer the excess ink to the contact roller and the excess portion of printing ink is removed from an image of the body to be printed. CONSTITUTION: In a separation means 61, filter layers 63 and 65 which are respectively divided into three areas (1), (2), and (3) are provided. An excess ink removing liquid in which a printing ink is mixed is separated at the filter in the area (1) and the excess ink removing liquid drops. When the area (1) is clogged, the liquid flows to the area (2). When the area (2) is clogged, the liquid flows to the area (3). If clogging is detected at every area, clogging state of the whole of the filters can be grasped. When the whole of the filters is clogged, the whole of the separation means 61 is exchanged. As the two filter layers 63 and 65 differ in ventilation resistance, separation can be performed efficiently regardless of the particle diameter of the printing ink to be separated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print image post-processing apparatus used in a printing apparatus such as stencil printing. The present invention is particularly effective as a countermeasure against set-off and strike-through in printed matter.

[0002]

2. Description of the Related Art In printing using a liquid printing ink, when printing materials are overlaid immediately after printing, the printing ink forming a printed image adheres to the back surface of one sheet, causing set-off. Also, immediately after printing, the printed image surface may be rubbed lightly with your fingertips, which may cause the printed image to collapse, or the printing ink that forms the printed image may pass through the substrate. Problems such as see-through on the back surface may occur.

These problems are particularly noticeable in stencil printing, in which the amount of printing ink forming a printed image on a printing medium, that is, the amount of ink buildup is larger than that of other printing.

[0004] Conventionally, in order to prevent the occurrence of such set-off and strike-through, attempts have been made to reduce the amount of inking on the printing medium during the printing process. However, it is difficult to quantitatively control the amount of buildup, and if the amount of buildup is suppressed too much, the density of the printed image will be reduced, the print will be blurred, and the quality of the printed image will be degraded.

As a means for avoiding the above-mentioned problems, it is conceivable to heat and dry the printing ink for forming a printed image, but in that case, a heater having a considerably large calorific value must be used. . In this way, when the printing material is dried by the drying means such as a heater, the higher the printing speed of the printing press, the more severe the conditions imposed on the drying means. Actually, the printing ink cannot be dried at such a high speed that an effect of preventing the occurrence of set-off and strike-through can be obtained.

In addition, depending on the printing method, fine powder such as starch or talc may be applied to the printed image surface to prevent set-off. However, such a fine powder coating device uses compressed air, and a printing device equipped with such a device becomes a considerably large printing device.

Further, the printing target after the printing is completed is a paper discharge tray,
When transporting to a sorter, etc.
The conveyance roller cannot be applied to the printed image surface of the printing medium. For this reason, conventionally, the printing medium has been transported by a transportation mechanism such as a belt conveyor that contacts only the back surface (non-printing image surface) of the printing medium. This type of printing medium conveying device is disclosed in, for example, Japanese Patent Application Laid-Open No. 50-88769.

However, if the printed material is conveyed by contacting only the back surface without contacting the printed image surface, when the copying paper is forcibly conveyed while being sandwiched from both sides like a copying machine such as a PPC. In comparison, the paper ejection performance is inferior, such as the occurrence of paper misalignment at the delivery destination such as the paper ejection tray or the sorter. This tendency has become remarkable as the printing speed, in other words, the paper discharge speed is increased. Further, such a problem greatly reduces the degree of freedom in setting the route of the sheet discharge conveyance path in the printing apparatus.

[0009]

The present inventors have invented a novel apparatus for removing excess ink from a printing medium in order to improve printing quality. This apparatus has a contact roller that rotates by applying a surplus ink removing liquid in a layered manner on the peripheral surface, and a counter roller that rotates in opposition to the contact roller,
The printed material is sandwiched and conveyed by the contact roller and the facing roller. Then, the excess printing ink on the printed image surface of the printing medium is transferred to the layered excess ink removing liquid of the contact roller, and the excess ink on the contact roller is a cleaning means such as a blade that contacts the contact roller. Remove by.

The excess ink removing liquid used in the above apparatus is a liquid that is incompatible with the printing ink and has a lower surface tension than the printing ink. Therefore, when the surplus ink is transferred from the printed matter to the contact roller coated with the surplus ink removing liquid, the surplus printing ink exists in a state of being dispersed in the surplus ink removing liquid. In the apparatus, since the excess ink removing liquid is reused, the excess ink removing liquid and the printing ink are separated by the separating means.

However, there has been a problem that the separating means becomes clogged as the number of times of use increases. Further, since the particle diameter of the printing ink separated from the excess ink removing liquid by the separating means also changes depending on the printing conditions such as the printing rate, it is difficult to perform reliable separation corresponding to this. Further, there is a problem that the clogging of the separating means cannot be detected in advance, and when the clogging suddenly occurs, the work is hindered.

The present invention is aimed at improving the above-mentioned apparatus for removing excess ink, which has been proposed by the inventors of the present application, by paying attention to the conventional problems as described above. It is possible to reliably avoid the occurrence of set-off and strike-through without inducing other obstacles, and to use the excess ink remover to remove the excess printing ink on the printed image surface, and also to print mixed excess. The ink and the surplus ink removing liquid can be reliably separated by the separating means regardless of the printing conditions, and the surplus ink removing liquid can be repeatedly used, and further the separating means caused by the separation of the surplus printing ink and the surplus ink removing liquid. It is an object of the present invention to provide a printed image post-processing device that can deal with the clogging of paper.

[0013]

According to a first aspect of the present invention, there is provided a printed image post-treatment device, which is applied with an excess ink removing liquid which is incompatible with the printing ink for forming a printed image and has a lower surface tension than the printing ink. Of the surplus printing ink among the printing ink forming the printed image of the printed material by transporting the printed material to be sandwiched between the contact member that is driven to rotate and the contact member. A facing member that transfers to the surplus ink removing liquid, a supply unit that supplies the surplus ink removing liquid to the contact member, a cleaning unit that removes the surplus ink together with the surplus ink removing liquid, and the surplus printing transferred from the printing medium. It is characterized by having a detachable separating means for separating the excess ink removing liquid containing ink into the excess ink removing liquid and the printing ink.

According to a second aspect of the present invention, there is provided a printed image post-processing apparatus according to the first aspect, wherein the separating means is a filter that retains excess printing ink and passes excess ink removing liquid. And a surplus ink removing liquid receiving portion that receives the surplus ink removing liquid that has passed through the filter.

According to a third aspect of the present invention, there is provided a printed image post-processing device according to the second aspect, wherein the filter is composed of two or more kinds of laminated filters having different ventilation resistances. Is characterized by.

A print image post-processing apparatus according to a fourth aspect is the print image post-processing apparatus according to the second aspect, wherein the side of the filter to which the excess ink removing liquid containing the excess printing ink is supplied is a partition member. It is characterized by being divided into a plurality of areas.

A print image post-processing device according to a fifth aspect is the print image post-processing device according to the fourth aspect, wherein at least a part of each region of the filter partitioned by the partition member has a filter eye. It is characterized in that means for detecting clogging is provided.

[0018]

The surplus ink removing liquid adhering to the peripheral surface of the contact member comes into contact with the printed image surface of the printing medium. The surplus of the printing ink forming the printed image is transferred to the surplus ink removing liquid layer of the contact member and is removed from the printing medium. The excess ink removing liquid is a liquid that is incompatible with the printing ink that forms a printed image and has a lower surface tension than the printing ink. Therefore, the surplus printing ink transferred to the surplus ink removing liquid layer exists on the surface of the surplus ink removing liquid layer in a floating state that is physically separated from the surplus ink removing liquid. Excess printing ink floating from the surface of the contact member
Along with the rotation of the contact member, the excess ink removing liquid is removed from the contact member by the cleaning unit that contacts the surface of the contact member.

The excess ink removing liquid containing the printing ink is separated into the excess ink removing liquid and the printing ink by the separating means. The printing ink is held by the filter, and the excess ink removing liquid that has passed through the filter is collected in the excess ink removing liquid receiving portion. The filter has a structure in which two or more kinds of filters having different printing ink capturing performances are laminated due to different ventilation resistance. Therefore, the filter can efficiently and reliably separate the printing ink from the excess ink removing liquid regardless of the particle size of the printing ink to be separated, and has excellent durability. Since the filter is divided into a plurality of regions by the partition member on the side to which the excess ink removing liquid containing the excess printing ink is supplied, the filters are sequentially clogged. Since clogging can be detected for each area, it is convenient for use because the deterioration or usage state of the filter can be grasped. The filter is removable, so you can replace it if all areas are clogged.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the stencil printing machine of the first embodiment will be described with reference to FIGS. The document image reading unit 5 has an image scanner 3 and reads an image of a document to be printed. The plate making unit 9 has a plate making device 7 and forms a punched image on the stencil printing base paper S in accordance with the document image data read by the document reading unit 5.

On the outer peripheral surface of the cylindrical printing drum 13, a stencil sheet S punched by the plate making section 9 is wound. An ink supply device 11 including an ink squeegee device is provided inside the print drum 13, and supplies ink to the inner peripheral surface of the print drum 13. Below the printing drum 13 is a press roller 15 that moves up and down. Press roller 15
Is configured to nip and convey the printing medium P supplied between the printing drum 13 and the press roller 15 between the printing drum 13 and form an image on the printing medium P.

In the paper feeding section 23, the printing medium P on the paper feeding table 17 is fed one by one by the paper separating roller 19, and the press roller 1 is fed by the paper feeding timing roller 21.
5 and the printing drum 13.

In the paper discharge section 33, the stripping claw 25 strips the material to be printed from the printing drum 13. The stripped printing material P is transported to the print image post-processing device 29 by the transport device 27 of the belt conveyor mechanism. The print image post-processing device 29 performs a process of removing excess ink from the print image of the printing medium P. The processed printing substrate is the paper output table 31.
It is discharged to and piled up.

The stencil printing base paper sheet S for which printing has been completed is peeled off from the printing drum 13 by the plate discharge section 35 and discarded.

The printing operation in the above configuration will be described.
The printing drum 13 is rotationally driven in the counterclockwise direction in the figure around its own central axis by a driving unit (not shown). The printing medium P is conveyed from the left side to the right side in the figure by the paper feed timing roller 21 at a predetermined timing synchronized with the rotation of the printing drum 13, and is supplied between the printing drum 13 and the press roller 15. The printing medium P is pressed by the press roller 15 against the stencil sheet S wound around the outer peripheral surface of the printing drum 13, and stencil printing is performed.

The printed substrate P is printed with the peeling claw 25.
Is peeled off from the print drum 13 and is sent to the print image post-processing device 29 by the paper discharge conveying device 27 with the print image surface facing upward. The printing medium P is the print image post-processing device 2
The sheet 9 is conveyed toward the sheet discharge tray 31 while being subjected to the post-processing operation of the print image, and is stacked on the sheet discharge tray 31.

Next, the structure and operation of the print image post-processing device 29 will be described. As shown in FIG. 2, the print image post-processing device 29 includes a contact roller 37 as a contact member that contacts the print image surface (upper surface) of the printing target P after printing is completed.
And a counter roller 39 as a counter member that is arranged to face the contact roller 37. The contact roller 37 and the counter roller 39 are rotatably supported in parallel with each other by shafts 41 and 43, respectively. The opposing roller 39 is urged upward in the figure, that is, toward the contact roller 37 by a spring as an urging means (not shown). When there is no printing target P between the contact roller 37 and the counter roller 39, the contact roller 37 and the counter roller 39 contact each other.

A blade 45, which is a plate-shaped member having a substantially rectangular cross section, is in contact with the outer peripheral surface 37a (surplus ink removing liquid application surface) of the contact roller 37. The blade 45 has a base end fixed to the tip of the sheet metal member, and the tip is in contact with the contact roller 37. The blade 45 is provided in a posture inclining above the apex of the contact roller 37, and the lower corner of the tip of the blade 45 is on the outer peripheral surface of the contact roller 37 on the rotation front side of the apex of the contact roller 37. It is in contact with 37a.

A surplus ink removing liquid supply nozzle 47 is provided above the outer peripheral surface 37a of the contact roller 37 on the front side in the rotation direction from the contact position between the blade 45 and the contact roller 37.
Is provided. Excess ink removal liquid supply nozzle 47
Is for removing the excess ink removing liquid from the outer peripheral surface 3 of the contact roller 37.
It is a supply means for supplying to 7a. Excess ink remover is
It is a liquid that is incompatible with the printing ink forming the printed image and has a surface tension lower than that of the printing ink.

When the excess ink removing liquid supply nozzle 47 supplies the excess ink removing liquid to the outer peripheral surface 37a of the contact roller 37, the excess ink removing liquid accumulates between the blade 45 and the contact roller 37 as shown in the figure. . Contact roller 37
With the rotation of, the excess ink removing liquid passes between the contact roller 37 and the blade 45 to form a layer on the surface of the contact roller 37. At this time, the blade 45 has a function of making the amount of the excess ink removing liquid formed on the outer peripheral surface 37a of the contact roller 37 uniform. Further, the blade 45 also functions as a cleaning unit that removes dirt on the outer peripheral surface 37a of the contact roller 37.

On the front side of the blade 45 with respect to the rotating direction of the contact roller 37, a sheet-like elastic body 49 is provided as a means for collecting the excess ink removing liquid. The sheet-shaped elastic body 49 is a thin plate-shaped member having a predetermined elasticity. At the contact point d located on the front side in the rotation direction of the contact roller 37 with respect to the contact position between the blade 45 and the contact roller 37,
The tip of the sheet-like elastic body 49 is in contact with the outer peripheral surface 37 a of the contact roller 37. Further, the sheet-shaped elastic body 49
Is arranged at a position closer to the contact roller 37 than the tangent line e of the contact roller 37 at the contact point d, and the rear end thereof is lower than the front end. Therefore, a part of the sheet-like elastic body 49 near the tip end portion is brought into close contact with the outer peripheral surface 37a of the contact roller 37 with a predetermined length.
It is elastically deformed following the shape of a.

The rear end portion of the sheet-like elastic body 49 is fixed to a tray member 51 for the excess ink removing liquid, which is arranged below the contact point d. The leading end of the sheet-like elastic body 49 is a free end and is in contact with the contact roller 37 as described above. In this way, the sheet-like elastic body 49 is arranged so that the free end of the elastic body 49 contacts the contact roller 37 and the fixed rear end of the elastic body 49 is positioned downward.

As shown in FIGS. 1 and 2, the tray member 5
A conduit 60 for discharging the excess ink removing liquid containing the excess ink is connected and communicated with the lower surface of 1. The conduit 60 is made of rubber and / or metal. The conduit 60 is led to the separating means 61. The separating unit 61 separates the excess ink removing liquid containing the printing ink into the printing ink and the excess ink removing liquid. The surplus ink removing liquid separated from the printing ink is sent to the surplus ink removing liquid supply nozzle 47 by a circulation means such as a pump, and is supplied again to the peripheral surface of the contact roller 37.

The separating means 61 will be described with reference to FIGS. The separating means 61 has a housing 62. Case 62
Is a flat closed box, which has the shape of a ship bottom with its bottom protruding downward. The inside of the housing is divided into an upper space and a lower space by two layers of filters 63 and 65 which are horizontally provided in the central portion. The excess ink removing liquid containing the excess printing ink is supplied to the upper space. The lower space is a surplus ink removing liquid receiving portion 67 that stores the surplus ink removing liquid that has passed through the filters 63 and 65. That is, when the liquid is supplied from above the filters 63 and 65,
The printing ink contained in the liquid is held in the two layers of filters 63 and 65, and the excess ink removing liquid passes through the filters 63 and 65 and collects in the excess ink removing liquid receiving portion 67.

Ventilation resistance of each filter 63, 65 [kPa
・ Sec / m ² ] is different. The ventilation resistance of the lower filter 65 is higher than that of the upper filter 63. In this way, the liquid supplied from the upper filter 63 side is evenly distributed to the lower filter 65 without accumulating in a specific place.

The filters 63 and 65 are divided into three by two partition members 71 and 71. Partition member 7
1 and 71 divide the filters 63 and 65 themselves into three parts, and project to the upper surface of the filters 63 and 65 to which the excess ink removing liquid containing excess printing ink is supplied, and these surfaces are divided into three regions ( It is divided into 1), (2) and (3). However, there is a gap between the upper edges of the partition members 71 and 71 and the inner surface of the upper wall of the housing 62, and the upper space in the housing 62 defined by the filters 63 and 65 is integrally communicated. .

Therefore, the liquid supplied to the area (1) is
Area (1)
After the filters 63 and 65 of 1 are clogged, the liquid supplied to the area (1) gets over the partition member 71 and enters the area (2). Similarly, after the filters 63 and 65 in the area (2) are clogged, the liquid supplied to the area (2) is separated by the partition member 71.
Overcome and enter area (3).

On the side wall of the casing 62, the conduit 60,
Connection pipes 66 and 64 connected to 60 are connected.
The connection pipe 66 is a housing 6 partitioned by the filters 63 and 65.
The excess ink removing liquid is introduced into the area (1) of the filters 63 and 65, which is guided to the upper space of the inside of 2. The connection pipe 64 penetrates the filters 63 and 65 and is guided to a surplus ink removing liquid receiving portion which is a space below the housing 62. The surplus ink removing liquid collected in the surplus ink removing liquid receiving portion is pumped out by the pump 68 via the connecting pipe 64 and the conduit 60, and is sent to the surplus ink removing liquid supply nozzle 47.

The ventilation resistance (R) can be calculated by the following equation. Ventilation resistance (R) = pressure difference (P) / aeration amount (V) Units are Pa for pressure difference (P) and m ³ / m for aeration amount (V)
² sec.

The Frazier type breathability tester uses a constant pressure difference P (for example, P = 0.5 inch hydraulic column) on both sides of the test piece.
Is a device for determining the air flow rate V passing through the test piece. Using this tester, the ventilation resistance (R)
Can be requested. The tester can also measure the pressure difference P at a constant air flow rate V.

As the filters 63, 65 of the separating means 61, all kinds of porous materials having a property of allowing passage of fluid such as non-woven fabric, woven fabric, gauze, filter paper, sponge, etc. can be used. For example, as the non-woven fabric, chemical fibers such as polyester, polypropylene, rayon, glass and acetate, and natural fibers such as wool, hemp and asbestos can be used. The manufacturing method is also not limited, and non-woven fabrics of all manufacturing methods can be used. Further, a porous material obtained by continuously foaming a continuous sheet of resin can also be used.

Although not shown, the filters 63 and 65 are provided.
Of the three areas (1), (2) and (3), at least two areas (2) and (3) are provided with clogging detection means. The clogging detecting means is composed of a transmission type or a reflection type infrared sensor, and detects the change in the light transmittance or the light reflectance of the filters 63 and 65 whose color has changed due to the printing ink to detect the clogging state. Can be detected.

Although not shown, in the present embodiment, the filter 6 is based on the detection result of the clogging detection means.
A display means for displaying the clogging state of 3,65 is provided. When the clogging of the area (2) of the filters 63 and 65 is detected, a yellow signal lights up on the display means, indicating that it is time to replace the filters. Area of filters 63 and 65
When the clogging of (3) is detected, a red signal lights up on the display means, indicating that the filter needs to be replaced urgently.

As shown in FIG. 3, the separating means 61 is
It is detachable from the print image post-processing device 29 provided in the stencil printing device of this embodiment. That is, in the print image post-processing device 29, the installation unit 9 for installing the separation means 61
0 is provided. The installation surface 90a of the installation unit 90 has a shape that matches the bottom surface of the housing 62 of the separating means 61, and supports the separating means 61 in a stable manner. The side walls 91 of the installation portion are provided with the conduits 60, 60 penetrating therethrough. Therefore, the separating means 61 is placed on the installation surface 90a, and the connecting pipes 64, 66 are placed.
If one side surface of the separating means 61 provided with is abutted against the side wall 91 of the installation portion 90, the connecting pipes 64 and 66 and the conduits 60 and 6
0 can be easily connected. Filters 63, 65
If the clogs occur, the separating means 6
1 can be easily removed from the installation section 90. Further, although not shown, detection means for detecting that the separation means 61 is installed in the print image post-processing device 29 is provided. When this detecting means detects the separating means 61, a green signal is lit on the display means to indicate that the device is in a usable state.

The surplus ink removing liquid is a liquid which is incompatible with the printing ink for forming a printed image on the printed image surface of the printing paper P and has a surface tension lower than that of the printing ink. Liquids that satisfy this condition include dimethyl silicone oil, phenyl, polyether, fluorine,
Modified silicone oils such as amino, epoxy, carboxyl, carbinol, methacryl, mercapto and phenol are used. In addition, an aqueous solution containing a surfactant, an organic solvent, etc. is also effective, but most of them are 1
(Cps) or less, and the excess ink removing liquid containing the printing ink may flow out to a portion other than the portion where the excess ink originally flows, which may stain the printed material, and thus it is necessary to make an appropriate selection.

Surfactants to be added to water include anionic, cationic, and amphoteric ionic and nonionic surfactants. The amount of this surfactant added depends on the surface tension of the excess ink removing liquid. It is determined to be lower than the surface tension of the printing ink.

The organic solvent added to water is an organic solvent compatible with water, and examples thereof include methanol, ethanol, isopropyl alcohol, n-propyl alcohol, ethylene glycol and glycerin.

After removing the excess ink, the contact roller 3
7 is evenly coated on the outer peripheral surface 37a, and the coating thickness is preferably about 0.0001 to 1 μm. Converting this to the amount of coating on the material to be printed, 0.1-100 mg / B
It will be about 4 sizes.

The contact roller 37, the counter roller 39, and the blade 45 are made of a material that does not cause swelling or other deterioration due to the excess ink removing liquid. When the main component of the excess ink removing liquid is, for example, silicone oil, the contact roller 37, the facing roller 39, the blade 45.
Is preferably composed of fluorine resin (rubber), phenyl-modified silicone resin (rubber), urethane rubber, or the like.

Next, the operation of the print image post-processing device 29 configured as described above will be described. The printed object P that has been printed is conveyed by being sandwiched between the contact roller 37 and the counter roller 39. The surplus ink removing liquid film a formed on the outer peripheral surface 37a of the contact roller 37 contacts the print image surface of the printing medium P. Due to this contact, of the printing ink b forming the print image on the printing medium P, the surplus printing ink is transferred to the surplus ink removing liquid film a of the contact roller 37, and the surplus printing ink is printed. Removed from body P.

Excess ink removing liquid film a of the contact roller 37
The printing ink c transferred to the sheet passes through the sliding contact portion between the sheet elastic body 49 and the contact roller 37 as the contact roller 37 rotates.

The surplus ink removing liquid used in this embodiment is a liquid which is incompatible with the printing ink b forming a printed image and whose surface tension is lower than that of the printing ink b. Therefore, the surplus ink removing liquid film a of the contact roller 37 to which the surplus printing ink c is transferred is formed by the blade 4
When scraped off by 5, the excess ink removing liquid pool f containing the printing ink c in a dispersed state is removed by the contact roller 37.
Occurs on the front side of the blade 45 with respect to the rotation direction.

The surplus ink removing liquid film a containing no printing ink c is regenerated on the outer peripheral surface 37a of the contact roller 37 after passing through the blade 45. Contact roller 37
Since the surplus ink removing liquid film a re-contacts with the print image surface of the print medium P, the print image surface of the print medium P is not contaminated by the print ink c transferred to the contact roller 37.

Outer peripheral surface 3 of blade 45 and contact roller 37
Since the contact position with 7a is on the front side in the direction of rotation from the apex of the contact roller 37, if the amount of the liquid in the excess ink removing liquid pool f exceeds a certain limit, the excess ink is generated even if the contact roller 37 is rotating. The excess ink removing liquid in the removing liquid reservoir f begins to flow in the direction opposite to the rotating direction of the contact roller 37 due to its own weight. The flow of the excess ink removing liquid is guided by the inclined upper surface of the sheet-like elastic body 49 and flows to the receiving tray 5
It falls into 1 and is collected.

The excess ink removing liquid containing the excess printing ink is recovered from the tray 51 through the conduit 60, the connecting pipe 66 and the separating means 61. This liquid is first supplied to the area (1) of the filters 63 and 65. This liquid is a region (1)
Printing ink is retained in the filters 63 and 65, and the excess ink removing liquid passes through the filters 63 and 65 and falls into the excess ink removing liquid receiving portion 67. Eventually, the filter 63 or 6 in the area (1)
5 is clogged and the excess ink removing liquid is filtered by the filter 63.
Or it cannot pass 65. When this clogging occurs, the liquid collected in the separating means 61 gets over the partition member 71 and flows out to the adjacent area (2). region
In (2), the same phenomenon as in region (1) occurs, and eventually the liquid flows into region (3). Filter 6 of separating means 61
Since the clogging state of Nos. 3 and 65 is detected for each area and displayed on the display means, it is convenient for use because the deterioration or use state of the filter can be grasped. Then, the filter 63,
If 65 is completely clogged, the old separating means 61 may be removed from the installation section 90 and replaced with a new separating means 61.

Filters 63 and 65 in the separating means 61
The excess ink removing liquid that has passed through is stored in the excess ink removing liquid receiving portion 67, is sent out by the pump to the excess ink removing liquid supply nozzle 47, and is supplied again to the outer peripheral surface 37a of the contact roller 37.

In this way, the material P to be printed has the contact roller 3
By passing between 7 and the counter roller 39, the surplus of the printing ink b forming the print image as described above is reliably removed from the outer peripheral surface 37a of the contact roller 37. This suppresses the occurrence of set-off and strike-through on the printed substrate, and prevents the printed image from collapsing even if the printed image surface is rubbed with a fingertip or the like immediately after the paper is ejected, and further forms the printed image. The drying of the printing ink b present becomes faster.

Further, the excess ink removing liquid mixed with the printing ink is separated by the separating means 61, and the separated excess ink removing liquid can be repeatedly used, which is economical. Since the separating means 61 is composed of two types of filters 63 and 65 having different ventilation resistances, the printing ink can be efficiently and reliably separated from the excess ink removing liquid regardless of the particle size of the printing ink to be separated, It also has excellent durability. Although the separating means 61 is composed of two kinds of filters having different ventilation resistances, it may be composed of three or more kinds of filters having different ventilation resistances. In addition, the filters 63 and 65
Since it is possible to detect clogging in each of a plurality of regions partitioned by the partition member, it is possible to grasp the deterioration or use state of the filter, which is convenient for use. The filter is removable, so you can replace it if all areas are clogged.

In the embodiment described above, the clogging of the filters 63 and 65 is detected by the infrared sensor. The filter clogging may be detected using an optical sensor in another wavelength range, may be detected by ultrasonic waves, or may be detected by a change in electrical characteristics such as electric resistance or capacitance. Electrical detection means may be used, or mechanical means may be used.

FIG. 6 shows the filter 6 by mechanical means.
The separation means 61a which detects the clogging of 3,65 is shown.
The same components as those of the separating means 61 are designated by the same reference numerals as those in FIG. 5 to the corresponding portions in FIG. Further, the parts which are different in structure from the separating means 61 but which are functionally identical to each other are designated by the reference numerals in FIG.
Attached to a considerable portion of the inside. In FIG. 6, each area (1)
, (2), (3) are provided with floats 80, respectively. The float 80 has a plate portion 82 and a pointing rod 81. The housing 62a is provided with a hole 83, and the float 80
The indicator rod 81 can be projected outward. In each area, when the filters 63 and 65 in the area are clogged, the excess ink removing liquid 85 mixed with the printing ink accumulates on the filter. The float 80 floats on the liquid 85, and the indicator rod 81 of the float 80 is attached to the hole 8 of the housing 62a.
It protrudes from 3 to notify the clogging of the area.

Next, another embodiment of the present invention will be described with reference to FIG. In FIG. 7, portions corresponding to those in FIG. 2 are designated by the same reference numerals as those in FIG. 2 and their description is omitted. In this embodiment, two rollers 5 which are vertically spaced from each other are used.
Flexible endless belt 5 as a contact member between 3, 55
7 is applied with a predetermined tension and is stretched over. Also according to this embodiment, it is possible to obtain substantially the same effect as that of the above embodiment.

[0062]

According to the present invention, the object to be printed is pressed against the contact member by the facing member, and the printed image surface is brought into contact with the excess ink removing liquid on the surface of the contact member. By this contact, the surplus of the printing ink forming the print image on the printing medium is completely removed. Therefore, the occurrence of set-off and strike-through on the printed material is surely avoided without inducing other obstacles, and the printed image is less likely to collapse even if the printed image surface is rubbed with a fingertip immediately after printing. Become.

The surplus ink removing liquid is a liquid that is incompatible with the printing ink forming the printed image and has a surface tension lower than the surface tension of the printing ink. Therefore, the printing ink transferred to the surplus ink removing liquid layer. Exists on the surface of the excess ink removing liquid layer in a floating state in which it is physically separated from the excess ink removing liquid. Therefore, the surplus ink floating in the surplus ink removing liquid can be removed by a cleaning means such as a blade that comes into contact with the peripheral surface of the contact roller and performs a scraping action.

The excess ink removing liquid containing the removed printing ink is separated into the printing ink and the excess ink removing liquid by the separating means installed in this apparatus. The separated excess ink removing liquid contains almost no printing ink and can be used again without any problem.

Since the separating means has a structure in which two kinds of filters having different printing ink capturing performances are laminated, the printing ink is efficiently and surely separated from the excess ink removing liquid regardless of the particle diameter of the printing ink to be separated. It is possible and has excellent durability. Since the filter is divided into a plurality of areas and clogging can be detected in each area, it is convenient in use because the deterioration or usage state of the filter can be grasped. The filter is removable, so you can replace it if all areas are clogged.

【The invention's effect】 [Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is an enlarged view of the print image post-processing device in FIG.

FIG. 3 is a perspective view of a separating means according to an embodiment.

FIG. 4 is a cross-sectional view of a separating means according to an embodiment.

5 is a sectional view taken along the line AA of FIG.

FIG. 6 is a cross-sectional view showing another configuration example of the separating means in one embodiment.

FIG. 7 is a diagram showing another configuration example of the print image post-processing device in the present invention.

[Explanation of symbols]

29 Print Image Post-Processing Device 37 Contact Roller as Contact Member 39 Opposing Roller as Opposing Member 45 Blade as Cleaning Means 47 Excess Ink Removal Liquid Supply Nozzle as Supplying Means 57 Endless Belt as Contacting Means 61, 61a Separating Means 63 , 65 Filter 71 Partition member 67 Excess ink removal liquid receiving part (1), (2), (3) Plural areas partitioned by partition member into filters P

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadanao Okuda 2-20-15 Shimbashi, Minato-ku, Tokyo Ideal Science Co., Ltd.

Claims (5)

[Claims] 1. A contact member, which is rotatably driven by applying a surplus ink removing liquid having a surface tension lower than that of the printing ink and which is incompatible with the printing ink for forming a printed image, and is printed between the contact member. The opposite member that transfers excess printing ink of the printing ink forming the print image of the printing object by sandwiching the printing object to the excess ink removing liquid, and removing the excess ink on the contact member. Supply means for supplying liquid, cleaning means for removing excess ink together with excess ink removing liquid, and excess ink removing liquid containing excess printing ink transferred from the substrate to be separated into excess ink removing liquid and printing ink And a detachable detaching means for removing the printed image. 2. The separation means includes a filter that holds excess printing ink and allows excess ink removal liquid to pass therethrough, and a surplus ink removal liquid receiving portion that receives the excess ink removal liquid that has passed through the filter. The printed image post-processing device described. 3. The printed image post-processing apparatus according to claim 2, wherein the filter is composed of two or more kinds of laminated filters having different ventilation resistances. 4. The print image post-processing apparatus according to claim 2, wherein the filter is divided into a plurality of regions by a partition member on the side to which the excess ink removing liquid containing the excess printing ink is supplied. 5. The printed image post-processing apparatus according to claim 4, wherein a means for detecting clogging of the filter is provided in at least a part of each area of the filter partitioned by the partition member.